JP2503110Y2 - piston ring - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a piston ring for oil scraping applied to an engine, a reciprocating compressor and the like.

[Conventional technology]

 A conventional example will be described with reference to FIGS.

Fig. 6 shows the oil scraping ring 01 attached to the piston 021.
7 is a sectional view of the oil scraping ring 01, and FIG.
Fig. 9 and Fig. 9 are cross-sectional views of the oil scraping ring urged outward from the inside, Fig. 10 is an explanatory view when the piston ring is lifted in the ring groove, and Fig. 11 is a tilted piston. FIG.

In an engine or a reciprocating compressor, the piston 021 reciprocates in the cylinder 022.
In order to prevent the high pressure fluid in the cylinder 022 from leaking from the clearance C between the two, the piston 021 has several piston rings 01,08,0.
9 is installed. Since the piston rings 01, 08, 09 slide in contact with the surface of the cylinder 022, lubricating oil is supplied, but in order to prevent consumption of a large amount of lubricating oil, the piston ring 01 on the lowermost stage is In particular, an oil scraping ring 01, which has a large scraping effect on lubricating oil, is adopted. As shown in FIG. 7 (a), the oil scraping ring 01 has its central part shaved off, and the sliding surface is divided into an upper part 011 and a lower part 012 to narrow the sliding surface to increase the surface pressure and to act as an oil scraper. In order to further increase the surface pressure, a leaf spring 03 as shown in FIG. 8 or a coil spring 05 as shown in FIG. 9 may be arranged on the back surface. Also, several oil escape holes 01a shown in FIG. 7 (b) are provided on the circumference.

Next, the operation of the conventional example will be described. The oil scraping ring 01 shown in FIGS. 7, 8 and 9 is a cylinder 022.
In addition to preventing high-pressure fluid from leaking, it also controls the amount of lubricating oil that rises upwards, and prevents large amounts of lubricating oil from being consumed.

[Problems to be solved by the device]

The oil scraping ring 01 seals the lubricating oil between the sliding surfaces 011 and 012 and the surface of the cylinder 022, and the ring lower surface 014 when the piston ring is seated on the lower surface of the ring groove.
When the piston ring is seated on the ring groove upper surface, it is sealed by the ring upper surface 013.

The movement of the oil scraping ring 01 in the ring groove is determined by the fluid pressure, the inertial force, the frictional force acting on the sliding surfaces 011 and 012, etc., but these are balanced and the oil scraping ring 01 floats in the ring groove. As shown in Fig. 10, when there is a gap of h _{1 at} the top and h _{2 at} the bottom (h ₁ + h ₂ = h), the ring upper surface 013 and the ring lower surface 0
The sealing action at 14 disappears. At this time, if the fluid pressure inside 022 becomes smaller, the lubricating oil will flow in the direction of the arrow,
Finally, the piston reaches the top of the piston 021 and is burned and consumed in the combustion chamber, and the consumption amount of lubricating oil increases.

Further, as shown in FIG. 11, when the piston 021 is inclined with respect to the cylinder liner 022, the lower sliding surface 012 does not come into contact with the surface of the cylinder 022 and the sealing effect is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the conventional device and to provide a piston ring which can reduce the consumption of lubricating oil and can reduce the cost.

[Means for solving the problem]

The piston ring of the present invention has a high-strength elastic rubber between the upper rail having a sliding surface on the outer periphery and the lower rail having a sliding surface on the outer periphery, and the outer peripheral surface of the inner ring is more inner than that of the upper and lower rails. It is characterized in that a piston ring having an oil scraping function, which is formed so as to be depressed toward the circumferential side, is sandwiched in a ring groove slightly narrower than the free length of the piston ring.

[Action]

When the piston ring of the present invention is installed in the ring groove, there is no clearance between the ring upper surface and the ring lower surface,
The oil scraping ring does not float, the sealing performance is improved, and the consumption of lubricating oil is reduced.

Further, even when the piston is inclined with respect to the cylinder, both the upper sliding surface and the lower sliding surface can follow the cylinder surface, so that the sealing performance is improved and the consumption of lubricating oil can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

1 (a) and 1 (b) are sectional views of a piston ring of the present invention, FIGS. 2 to 3 are other embodiments of the piston ring, and FIG. 4 is a mounting state of the piston ring in a ring groove. Figure,
FIG. 5 is an explanatory view of the operation when the piston is tilted.

As shown in FIGS. 1 (a) and 1 (b), a high-strength elastic rubber 2 is provided between an upper rail 1a having a sliding surface 11 on the outer circumference and a lower rail 1b having a sliding surface 12 on the outer circumference. As shown in FIG. 3 to FIG. 3, the outer peripheral surfaces of the rails are the upper rail 1a and the lower rail 1b.
The sliding surfaces (outer peripheral surfaces) 11 and 12 are fitted so as to be depressed toward the inner peripheral side. Further, the high-strength elastic rubber 2 is provided with several oil escape holes 2a on the circumference.

Further, in order to increase the surface pressure of the sliding surfaces 11 and 12, a leaf spring 3 as shown in FIG. 2 or a coil spring as shown in FIG. 3 may be arranged on the back surface. Next, the operation of the above embodiment will be described.

FIG. 4 shows the piston ring of the present invention mounted in the ring groove of the piston 21. Since the relationship between the width t of the piston ring in the free state and the width T of the ring groove is t> T, the ring upper surface 13 and the ring lower surface 14 are always sealed at the time of mounting.

Further, as shown in FIG. 5, even when the piston 21 is inclined with respect to the cylinder liner 22, the high-strength elastic rubber 2 is bent, and the upper sliding surface 11 and the lower sliding surface 12 are both cylinders 22. Since it comes into contact with, the sealing effect can be maintained.

Since the position where the piston ring of this embodiment is used is not so high, it is a temperature atmosphere in which rubber can be used sufficiently.

[Effect of device]

The piston ring of the present invention is constructed as described above,
A high sealing effect can be obtained by pressing the upper and lower rails against the upper and lower surfaces of the ring groove by the compression reaction force of the high-strength elastic rubber sandwiched between the upper and lower rails.
It is possible to prevent oil from passing through the back of the piston ring and reduce the consumption of lubricating oil. Furthermore, even if the piston is tilted with respect to the cylinder liner,
Bending occurs in the high-strength elastic rubber part, and the outer peripheral surfaces of the upper and lower rails evenly contact the sliding surface of the cylinder liner.
Good sealability can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of a piston ring according to an embodiment of the present invention, FIGS. 2 and 3 are sectional views of other embodiments, and FIG. 4 is a mounting state of the piston ring in a ring groove. Figure,
FIG. 5 is an explanatory view of the operation when the piston is tilted, 6 to 11
FIG. 6 is a conventional example, FIG. 6 is a state of mounting on a piston, FIG. 7 is a sectional view of an oil scraping ring, FIGS. 8 and 9 are sectional views of other conventional examples, and FIG. FIG. 11 is an explanatory view when the scraping ring is lifted in the ring groove, and FIG. 11 is an operation explanatory view of the oil scraping ring when the piston is tilted. 1a, 4a …… upper rail, 1b, 4b …… lower rail, 2 …… high-strength elastic rubber, 11 …… upper sliding surface, 12 …… lower sliding surface,
21 …… Piston, 22 …… Cylinder.

Claims (1)

(57) [Scope of utility model registration request] 1. A high-strength elastic rubber is provided between an upper rail having a sliding surface on the outer periphery and a lower rail having a sliding surface on the outer periphery so that the outer peripheral surface is inside the outer peripheral surfaces of the upper rail and the lower rail. A piston ring, characterized in that a piston ring formed by being sandwiched so as to be depressed toward the circumferential side is sandwiched in a ring groove slightly narrower than the free length of the piston ring.